A Block That Has a Mass M = 4

Multiple Choice

A block that has a mass M = 4.25 kg is hanging at rest on a light string.A projectile with a mass m = 250 g moving horizontally strikes M and sticks to it.The block and its projectile swing up and the center of mass rises a distance h = 12.0 cm.The speed of the projectile is approximately

A) 28 m/s
B) 42 m/s
C) 0.28 km/s
D) 26 m/s
E) 14 m/s